OPGW An Important Communication Link

Optical ground wire (OPGW) plays an important role in monitoring and controlling substations. By embedding a 48-count fiber optic cable inside of the ground wire a continuous, multi-channel communication link is established along transmission lines. This link carries telemetry from sensors and control devices to an operational control center. It is an elegant solution and allows for control of the grid and coordination between utility operators.

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Electric Conduit Construction (ECC) fiber technicians and splicing crews completed a 30-mile OPGW installation. The scope of work (SOW) required 29 splices, coiling slack and securing it, along with the completed splice case, onto an “I” brace mounted on the tower.

By planning each site carefully, the crews completed two splices each day. Each splice required the ground wired to be cut away revealing the fiber optic cable. A bulkhead fitting seals to the steel cable allowing the fiber to pass through the case and form a weathertight seal to the splice case. When this is complete for both ends of the OPGW the 48 count fiber strands are fusion spliced, ODTR tested and arranged inside the case. The case is then sealed and, along with the slack, fastened to the “I” brace.

This process requires skilled crews, proper equipment and quality control to ensure that an optically clear splice has been completed.